Changes (and minor corrections) to QByteArray documentation.

- Note in operator+= and append() that QByteArray preallocates, meaning that
  appending data in typical cases does not suffer from allocation overhead.

- Note that in the best case, appending or prepending can be O(1) thanks to
  copy-on-write semantics.

  Also make it clear that if the shared data is later changed, a full data copy
  is performed. This was only previously noted in the constructor.

- Note that in the worst case, the data copy requires linear time.

- Also a slight readability change: 'and that takes' vs 'taking'.

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